My b2evolution Version: Not Entered

I found out that when I use the option: ?disp=catdir , on my photoalbum that it gives links to another place then the actual albums are .. so now you can not leave a comment

For example :

?disp=catdir link : http://websitename/photoblog.php/frankrijk-2010/

But the real page where you can add comments is :

http://websitename/photoblog.php/frankrijk-2010

As you can see it is just an extra /
So I hope some one has an idea how to change this , so the / at the end is not there , and people will be send to : http://websitename/photoblog.php/frankrijk-2010

Hope it is clear .. and someone can help me
TX